OK Folks, it burps even when empty!

[Exnavydiver]

The last time I dumped the black tank I got a burp when I did a power flush (fill bowl to top and flush). The gauge reads one light (empty). It is still burping when half full of water. I believe my options are to either use a long rod or shove a hose down the vent stack and see if the bottom of the vent pipe is fouled. I will check the vent cover in the morning to see if I have birds or spider web plug under the cap. Any other suggestions will be appreciated..

[DQDick]

I think, based on what you've said, that I'd try the vent pipe next.

[1retired06]

Sounds like the right next step to me as well.

[Overlord]

Vent blockage most likely, but also could be a dreaded pyramid build-up.

[Exnavydiver]

Overlord got it!!, I ran jetting nozzle down vent and hit hard bottom of tank without obstruction so I came down off the roof and dumped a 5 gallon bucket of water into the toilet. most went down but I could see standing water(or whatever) above the turn in the pipe. I went out to my stash of items I had made up when we first hit the road and never got to use and dug out my 4 ft pyramid hose. I attached that to my outside shower hose with a valve on the back end and dragged it into the bathroom. It took about 3 minutes for the jet to cut it up and the water was getting high in the bowl when it suddenly let go and all ran out. I followed that with 2 additional 5 gal buckets of hot soapy water and a 40 minute flush. I think I got it all. Last week after I flushed I got distracted and forgot to close the black tank gate. I saw it open the next morning and closed it but evidently that was enough to get it started... First time for everything...

[Ozz]

Glad you got the job done Dave, I remember my first one, no fun at all.
Enjoy the rest of your winter there Buddy. Say hi to Betsy.

[DQDick]

Glad you got it fixed. Hard to believe it could build up that fast.